package cn.codergege.shiro.chapter6.dao.impl;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.annotation.Resource;

import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.PreparedStatementCreator;
import org.springframework.jdbc.support.GeneratedKeyHolder;
import org.springframework.jdbc.support.KeyHolder;
import org.springframework.stereotype.Repository;

import cn.codergege.shiro.chapter6.dao.UserDao;
import cn.codergege.shiro.chapter6.model.User;

@Repository("userDao")
public class UserDaoImpl implements UserDao {

	@Resource
	private JdbcTemplate jdbcTemplate;

	@Override
	public User createUser(User user) throws Exception {
        final String sql = "insert into sys_users(username, password, salt, locked) values(?,?,?, ?)";
        KeyHolder keyHolder = new GeneratedKeyHolder();
        jdbcTemplate.update(new PreparedStatementCreator() {
			@Override
			public PreparedStatement createPreparedStatement(Connection con) throws SQLException {
				PreparedStatement ps = con.prepareStatement(sql, new String[] { "id" });
				ps.setString(1, user.getUsername());
				ps.setString(2, user.getPassword());
				ps.setString(3, user.getSalt());
				ps.setBoolean(4, user.getLocked());
				return ps;
			}
		}, keyHolder);
        user.setId(keyHolder.getKey().longValue());
		return user;
	}

	@Override
	public void updateUser(User user) throws Exception {
        String sql = "update sys_users set username=?, password=?, salt=?, locked=? where id=?";
        jdbcTemplate.update(sql, user.getUsername(), user.getPassword(), user.getSalt(), user.getLocked(), user.getId());
	}

	@Override
	public void deleteUser(Long userId) throws Exception {
        String sql = "delete from sys_users where id=?";
        jdbcTemplate.update(sql, userId);
	}

	@Override
	public void correlationRoles(Long userId, Long... roleIds) throws Exception {
        if(roleIds == null || roleIds.length == 0) {
            return;
        }
        String sql = "insert into sys_users_roles(user_id, role_id) values(?,?)";
        for(Long roleId : roleIds) {
            if(!exists(userId, roleId)) {
                jdbcTemplate.update(sql, userId, roleId);
            }
        }
	}

	@Override
	public void uncorrelationRoles(Long userId, Long... roleIds) throws Exception {
        if(roleIds == null || roleIds.length == 0) {
            return;
        }
        String sql = "delete from sys_users_roles where user_id=? and role_id=?";
        for(Long roleId : roleIds) {
            if(exists(userId, roleId)) {
                jdbcTemplate.update(sql, userId, roleId);
            }
        }
	}

    private boolean exists(Long userId, Long roleId) {
        String sql = "select count(1) from sys_users_roles where user_id=? and role_id=?";
        return jdbcTemplate.queryForObject(sql, Integer.class, userId, roleId) != 0;
    }

	@Override
	public User findOne(Long userId) {
        String sql = "select id, username, password, salt, locked from sys_users where id=?";
        List<User> userList = jdbcTemplate.query(sql, new BeanPropertyRowMapper<User>(User.class), userId);

        if(userList.size() == 0) {
            return null;
        }
        return userList.get(0);
	}

	@Override
	public User findByUsername(String username) {
        String sql = "select id, username, password, salt, locked from sys_users where username=?";
        List<User> userList = jdbcTemplate.query(sql, new BeanPropertyRowMapper<User>(User.class), username);
        if(userList.size() == 0) {
            return null;
        }
        return userList.get(0);
	}

	@Override
	public Set<String> findRoles(String username) {
        String sql = "select role from sys_users u, sys_roles r,sys_users_roles ur where u.username=? and u.id=ur.user_id and r.id=ur.role_id";
        return new HashSet<String>(jdbcTemplate.queryForList(sql, String.class, username));
	}

	@Override
	public Set<String> findPermissions(String username) {
        //TODO 此处可以优化，比如查询到role后，一起获取roleId，然后直接根据roleId获取即可
        String sql = "select permission from sys_users u, sys_roles r, sys_permissions p, sys_users_roles ur, sys_roles_permissions rp where u.username=? and u.id=ur.user_id and r.id=ur.role_id and r.id=rp.role_id and p.id=rp.permission_id";
        return new HashSet<String>(jdbcTemplate.queryForList(sql, String.class, username));
	}

}
